Supramolecular Chemistry at the Liquid/Solid Interface
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0901-Ra20-01.1
Supramolecular Chemistry at the Liquid/Solid Interface Steven De Feyter1, Hiroshi Uji-i1, Atsushi Miura1, Wael Mamdouh1, Jian Zhang1, Jan van Esch2, Ben Feringa2, A. P. H. J. Schenning3, E. W. Meijer3, Frank Wuerther4, Frans C. De Schryver1 Department of Chemistry, Laboratory of Photochemistry and Spectroscopy, Katholieke Universiteit Leuven, Celestijnenlaan 200-F, 3001 Leuven, Belgium 1 Material Science Center, Stratingh Institute, Laboratory of Organic and Inorganic Molecular Chemistry, University of Groningen, Nijenborg 4, 9747 AG Groningen, The Netherlands 2 Laboratory of Macromolecular and Organic Chemistry, Eindhoven University of Technology PO Box 513, 5600 MB Eindhoven, The Netherlands 3 Institut für Organische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany ABSTRACT The liquid/solid interface provides an ideal environment to investigate self-assembly phenomena and scanning tunneling microscopy (STM) is the preferred methodology to probe the structure and the properties of physisorbed monolayers on the nanoscale. Physisorbed monolayers are of relevance in areas such as lubrication, patterning of surfaces on the nanoscale, and thin film based organic electronic devices, to name a few. It's important to gain insight in the factors which control the ordering of molecules at the liquid/solid interface in view of the targeted properties. STM provides detailed insight into the importance of molecule-substrate (epitaxy) and molecule-molecule interactions to direct the ordering of both achiral and chiral molecules on the atomically flat surface. The electronic properties of the self-assembled physisorbed molecules can be probed by taking advantage of the operation principle of STM, revealing spatially resolved intramolecular differences within these physisorbed molecules. INTRODUCTION Control of the lateral assembly and spatial arrangement of micro- and nano-objects at interfaces is often a prerequisite when it comes to potential applications in the field of nanoscience and technology. Self-assembly methods provide a valuable approach to make defined structures with dimensions on the nanometer scale. Chemisorption renders the modified substrate properties which differ significantly from the 'naked' substrate, which makes these chemisorbed self-assembled monolayers of prime interest for technological applications. Modification of the exposed groups at the monolayer/air interface leads to a wealth of possibilities to change the properties of the layer, which can be achieved on the nanometer scale by SPM [1,2]. In contrast to chemisorption, physisorption is not very suitable for making "permanent" architectures. Nevertheless, these physisorbed adlayers are model systems to investigate the interplay between molecular structure and the formation of ordered assemblies in two dimensions. In addition, SPM techniques allow the investigation of molecular properties (conformation, reactivity, chirality, electronic properties) often at the single molecule level. STM is one of the preferred te
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